Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Royalties	$ 1,743,747	$ 1,671,070
Research and development, net	(17,759)	(12,738)
Total revenues	1,725,988	1,658,332
Costs and Expenses:
Cost of royalty revenues	88,773	84,092
Research and development	6,828,064	4,718,972
In-process research and development		24,347,815
General and administrative	3,616,085	3,529,002
Total costs and expenses	10,532,922	32,679,881
Loss from operations	(8,806,934)	(31,021,549)
Other Expense:
Interest income	105,194	40,271
Interest expense	(739,757)	(866,945)
Total other expense, net	(634,563)	(826,674)
Net loss	$ (9,441,497)	$ (31,848,223)
Net loss per common share (basic and diluted)	$ (0.07)	$ (0.30)
Weighted average common shares (basic and diluted)	129,019,984	107,934,493
Total comprehensive loss	$ (9,409,710)	$ (31,839,628)